Alert archive / New York / Areal Flood Advisories in 2021

Areal Flood Advisory 63, NWS New York, NY

July 12, 2021Orange County, New York

NWS New York, NY issued this areal flood advisory at Jul 12, 2021, 7:46 PM EDT for Orange County, New York. It was in force for 119 min.

The area

The counties it named.

The facts

Issued
Jul 12, 2021, 7:46 PM EDT (23:46 UTC)
Expired
Jul 12, 2021, 9:45 PM EDT
In force
119 min
Issued by
NWS New York, NY
Area
Storm-based polygon

County Orange County, NY

The radar

The Albany radar (KENX), 133 km from the middle of the area, began a volume at 23:45 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.8 hours before the alert went out and 135 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2021-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 857 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2021-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 85 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
857 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
697 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
85 m²/s²
0-3 km storm-relative helicity
114 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS New York, NY wrote its last area forecast discussion before this areal flood advisory went out at Jul 12, 6:24 PM EDT, 1 hour 22 minutes earlier.

Area forecast discussion, Jul 12, 6:24 PM EDT, 1 hour 22 minutes before
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Hazardous weather outlook, Jul 12, 6:09 PM EDT, 1 hour 37 minutes before
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In the hours before

Special weather statement, Jul 12, 3:45 PM EDT, 4 hours 1 minute before
Special Weather Statement
National Weather Service New York NY
345 PM EDT Mon Jul 12 2021

NJZ108-NYZ074-122015-
Eastern Union-Richmond (Staten Is.)-
345 PM EDT Mon Jul 12 2021

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN UNION AND RICHMOND
COUNTIES...

At 345 PM EDT, a strong thunderstorm was located over Sayreville, or
near Perth Amboy, moving northeast at 25 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Elizabeth, Linden, Todt Hill, Huguenot, The Verrazano Narrows Bridge,
Port Richmond, Tottenville, Oakwood, Annadale, Rahway, New Dorp,
Roselle, Grasmere, Heartland Village and Greenridge.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4050 7428 4051 7426 4052 7425 4055 7425
      4056 7422 4059 7421 4060 7422 4059 7429
      4061 7431 4069 7423 4066 7415 4064 7416
      4064 7412 4061 7403 4053 7410 4050 7422
TIME...MOT...LOC 1945Z 230DEG 22KT 4047 7429

JM
Special weather statement, Jul 12, 5:41 PM EDT, 2 hours 5 minutes before
Special Weather Statement
National Weather Service New York NY
541 PM EDT Mon Jul 12 2021

NJZ002-004-103-NYZ067-069-122230-
Western Bergen-Western Passaic-Eastern Passaic-Rockland-Orange-
541 PM EDT Mon Jul 12 2021

...A STRONG THUNDERSTORM WILL AFFECT PASSAIC...NORTHWESTERN BERGEN...
SOUTH CENTRAL ORANGE AND ROCKLAND COUNTIES...

At 540 PM EDT, a strong thunderstorm was located over West Milford,
moving east at 25 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Wayne, New City, West Milford, Monsey, Ramsey, Ringwood, Pompton
Lakes, Suffern, Sloatsburg, Bloomingdale, Pomona, Upper Greenwood
Lake, Spring Valley, Oakland and Wanaque.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4107 7449 4109 7450 4120 7437 4124 7445
      4118 7396 4091 7427 4093 7429 4097 7428
      4098 7430 4100 7430 4100 7435 4101 7435
      4101 7439 4103 7442 4102 7443 4104 7443
      4105 7445 4104 7450
TIME...MOT...LOC 2140Z 277DEG 21KT 4112 7442

JM
Local storm report, Jul 12, 7:27 PM EDT, 19 minutes before
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The office that day

Everything else NWS New York, NY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 12, 2:18 AM EDTSpecial Weather StatementOKXBronx, Kings, Nassau, New York, Queens42 min
Jul 12, 3:37 PM EDTSpecial Marine WarningOKX38 min
Jul 12, 3:45 PM EDTSpecial Weather StatementOKXRichmond30 min
Jul 12, 3:53 PM EDTAreal Flood AdvisoryOKXRichmond49 min
Jul 12, 4:18 PM EDTAreal Flood AdvisoryOKXBronx, New York52 min
Jul 12, 5:38 PM EDTAreal Flood AdvisoryOKXOrange, Rockland112 min
Jul 12, 5:41 PM EDTSpecial Weather StatementOKXRockland49 min
Jul 12, 5:51 PM EDTSevere Thunderstorm WarningOKXOrange, Rockland39 min
Jul 12, 6:09 PM EDTFlash Flood WarningOKXOrange, Rockland3 hr
Jul 12, 6:15 PM EDTTornado WarningOKXOrange, Rockland45 min
Jul 12, 6:58 PM EDTSevere Thunderstorm WarningOKXOrange, Rockland41 min
Jul 12, 4:55 PM EDTAreal Flood AdvisoryOKXBergen32 min

Nearby

Areal Flood Advisories in New York, 2021Every areal flood advisory in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.